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        display: block;
        position: absolute;
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        border-right: 4px solid #f0f0f0;
        word-wrap: break-word;
        overflow-wrap: break-word;
        box-sizing: border-box;
        margin-left: -200px;
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<section id="docs-auto">
    <ol>
        <li><a href="http://docs.ckeditor.com/">CKEditor 文档站点</a></li>
        <li>
            <a href="http://mxr.mozilla.org/">MXR：Mozilla 源代码交叉引用</a>
        </li>
        <li class="toggle">
            <details>
                <summary>风格指南</summary>
                <ol>
                    <li>
                        <a href="http://www.economist.com/research/StyleGuide/">经济学人风格指南</a>
                    </li>
                    <li>
                        <a href="https://www.amazon.com/gp/product/0226104036/">芝加哥风格手册</a>
                    </li>
                    <li>
                        <a href="http://www.answers.com/library/Dictionary">Answers.com 字典</a>
                    </li>
                    <li>
                        <a href="http://www.wsu.edu/~brians/errors/">英语中的常见错误</a>
                    </li>
                </ol>
            </details>
        </li>
    </ol>
</section>